I didn't hear that claim anywhere in the video, but if that is what he claims, he's going to need one reaaaaaally big battery!
Yes, now you're into the realm of perpetual motion hoaxes, if that's what this guy's about. There is one line about him being able to run his car on water alone (though he isn't doing it right now - perhaps becuause he can't figure out that pesky perpetual motion thing, but I don't want to assume that), but it doesn't go into any detail about that. He does
explicitly state that his welding torch machine is plugged-into a wall outlet.